this post was submitted on 06 Oct 2023
96 points (95.3% liked)
Linux
48435 readers
630 users here now
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Rules
- Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.
- No misinformation
- No NSFW content
- No hate speech, bigotry, etc
Related Communities
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
founded 5 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Yes, they’re giving “very simplistic” and also demonstrating how to deny and add access in multiple ways.
It’s also not uncommon to do things like that. The default firewall config in Fedora is wide open for every port above 1024.
I set up a rule last night to allow SSH access from any device on my subnet, is it a good idea to add a separate rule blocking SSH from my router? I’ve already set up SSH with public key authentication so in theory there aren’t many devices that can access it but the firewall restriction seemed like a good idea
If you are worried that an attacker may have compromised your router and that key auth is not secure enough, then yes it would make sense.
I move ssh to a non-default port, only allow key based auth and install fail2ban. This is enough for me. It protects against automated attacks hitting port 22 and prevents brute force.
I don’t think my router has been compromised and I think it’s pretty unlikely it will be, but the extra rule seems pretty trivial to set up so if there are no downsides I may as well! I have already changed the SSH port and disabled password login. I’ll look into fail2ban, might be worth it if it’s relatively simple to set up!